/*-
	 * Copyright (c) 1990 The Regents of the University of California.
	 * All rights reserved.
	 *
	 * This code is derived from locore.s.
	 *
	 * Redistribution and use in source and binary forms, with or without
	 * modification, are permitted provided that the following conditions
	 * are met:
	 * 1. Redistributions of source code must retain the above copyright
	 *    notice, this list of conditions and the following disclaimer.
	 * 2. Redistributions in binary form must reproduce the above copyright
	 *    notice, this list of conditions and the following disclaimer in the
	 *    documentation and/or other materials provided with the distribution.
	 * 3. All advertising materials mentioning features or use of this software
	 *    must display the following acknowledgement:
	 *      This product includes software developed by the University of
	 *      California, Berkeley and its contributors.
	 * 4. Neither the name of the University nor the names of its contributors
	 *    may be used to endorse or promote products derived from this software
	 *    without specific prior written permission.
	 *
	 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	 * SUCH DAMAGE.
	 */
	
/* $FreeBSD: src/lib/libc/i386/string/bcopy.S,v 1.6.6.2 2002/11/07 19:35:25 sobomax Exp $ */

.globl memcpy
memcpy:
        pushl   %esi
        pushl   %edi
        movl    12(%esp),%edi
        movl    16(%esp),%esi
        movl    %edi,%eax
        movl    20(%esp),%ecx
        movl    %edi,%edx
        subl    %esi,%edx
        cmpl    %ecx,%edx       /* overlapping? */
        jb      1f
        cld                     /* nope, copy forwards. */
        movl    %ecx,%edx
        shrl    $2,%ecx         /* copy by words */
        rep
        movsl
        movl    %edx,%ecx
        andl    $3,%ecx         /* any bytes left? */
        rep
        movsb
        popl    %edi
        popl    %esi
        ret
1:
        addl    %ecx,%edi       /* copy backwards. */
        addl    %ecx,%esi
        std

        movl    %ecx,%edx
        andl    $3,%ecx         /* any fractional bytes? */
        decl    %edi
        decl    %esi
        rep
        movsb
        movl    %edx,%ecx       /* copy remainder by words */
        shrl    $2,%ecx
        subl    $3,%esi
        subl    $3,%edi
        rep
        movsl
        popl    %edi
        popl    %esi
        cld
        ret

